<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        [v-cloak]{
            display: none;
        }
    </style>
</head>

<body>
    <div id="app">
        <p>{{msg}}</p>
        <div v-pre>
            <p>我是个p1</p>
            <p>我是个p2{{msg}}</p>
            <p>我是个p3</p>
            <p>我是个p4</p>
        </div>
        <p v-cloak>{{msg}}</p>   
        <p v-once>{{msg}}</p>     
    </div>
    <script src="./js/vue.js"></script>

    <script>
        let vm = new Vue({
            el: "#app",
            data: {
               msg:"hi"
            }
        })

    </script>
</body>

</html>